CHARACTERIZATION OF POROUS CARBONS WITH HIGH-RESOLUTION ALPHA(S)-ANALYSIS AND LOW-TEMPERATURE MAGNETIC-SUSCEPTIBILITY

The effectiveness of integrated characterization of porous carbons wit h different approaches such as the high resolution alpha(s)-method for N-2, adsorption, X-ray diffraction, and magnetic susceptibility measu rement is shown. The theoretical basis for the high resolution alpha(s )-analysis for N-2, adsorption using GCMC simulation and the backgroun d of magnetic susceptibility of carbon are given. The applicability of the integrated characterization to changes of ACF with heating at 147 3-3173 K in Ar is shown. The activated mesocarbon microbead (a-MCMB) a nd activated carbon aerogel (a-CA) were examined by the integrated cha racterization method. a-MCMB showed an unusual magnetic relaxation bel ow 10 K due to random magnetism. The random magnetism was associated w ith the mutually isolated network structure of nanographitic units. a- CA also showed random magnetism at low temperature, which was associat ed with the spin isolated nanographitic structure similar to a-MCMB. ( C) 1998 Elsevier Science B.V. All rights reserved.